ERROR:tryton.common.common:  File "/home/javier/Proyectos/tryton/src/tryton/3.4/tryton/gui/window/view_form/view/list.py", line 996, in __sig_switch
    if not self.screen.row_activate() and self.children_field:

  File "/home/javier/Proyectos/tryton/src/tryton/3.4/tryton/gui/window/view_form/screen/screen.py", line 340, in default_row_activate
    self.switch_view(view_type='form')

  File "/home/javier/Proyectos/tryton/src/tryton/3.4/tryton/gui/window/view_form/screen/screen.py", line 365, in switch_view
    self.load_view_to_load()

  File "/home/javier/Proyectos/tryton/src/tryton/3.4/tryton/gui/window/view_form/screen/screen.py", line 386, in load_view_to_load
    self.add_view_id(view_id, view_type)

  File "/home/javier/Proyectos/tryton/src/tryton/3.4/tryton/gui/window/view_form/screen/screen.py", line 399, in add_view_id
    return self.add_view(view)

  File "/home/javier/Proyectos/tryton/src/tryton/3.4/tryton/gui/window/view_form/screen/screen.py", line 424, in add_view
    view = View.parse(self, xml_dom, view.get('field_childs'))

  File "/home/javier/Proyectos/tryton/src/tryton/3.4/tryton/gui/window/view_form/view/__init__.py", line 45, in parse
    return ViewForm(screen, root)

  File "/home/javier/Proyectos/tryton/src/tryton/3.4/tryton/gui/window/view_form/view/form.py", line 108, in __init__
    container = self.parse(xml)

  File "/home/javier/Proyectos/tryton/src/tryton/3.4/tryton/gui/window/view_form/view/form.py", line 143, in parse
    parser(node, container, node_attrs)

  File "/home/javier/Proyectos/tryton/src/tryton/3.4/tryton/gui/window/view_form/view/form.py", line 328, in _parse_group
    group = self.parse(node)

  File "/home/javier/Proyectos/tryton/src/tryton/3.4/tryton/gui/window/view_form/view/form.py", line 143, in parse
    parser(node, container, node_attrs)

  File "/home/javier/Proyectos/tryton/src/tryton/3.4/tryton/gui/window/view_form/view/form.py", line 171, in _parse_label
    field = self.screen.group.fields[attributes['name']]

'information_from'